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HttpCookieCollection Class

Provides a type-safe way to manipulate HTTP cookies.

Namespace:  System.Web
Assembly:  System.Web (in System.Web.dll)

[AspNetHostingPermissionAttribute(SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
public sealed class HttpCookieCollection : NameObjectCollectionBase

The following code example demonstrates how to read cookies using the Cookies property of the HttpRequest object and write cookies using the Cookies property of the HttpResponse object. Both properties return HttpCookieCollection objects. If either of two cookies named userName and lastVisit are not in the HTTP request, then they are created in the HTTP response. If the two cookies exist, the properties of the cookies are displayed.

<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">

<script runat="server">

    protected void Page_Load(object sender, EventArgs e)
        StringBuilder sb = new StringBuilder();
        // Check to see if cookies exist in HTTP request. 
        if (Request.Cookies["userName"] == null && 
            Request.Cookies["lastVist"] == null)
            Response.Cookies["userName"].Value = "user name";
            Response.Cookies["userName"].Expires = DateTime.Now.AddMinutes(20d);

            HttpCookie aCookie = new HttpCookie("lastVisit");
            aCookie.Value = DateTime.Now.ToString();
            aCookie.Expires = DateTime.Now.AddMinutes(20d);
            sb.Append("Two cookies added to response. " + 
                "Refresh the page to read the cookies.");
            HttpCookieCollection cookies = Request.Cookies;
            for (int i = 0; i < cookies.Count; i++)
                sb.Append("Name: " + cookies[i].Name + "<br/>");
                sb.Append("Value: " + cookies[i].Value + "<br/>");
                sb.Append("Expires: " + cookies[i].Expires.ToString() +
        Label1.Text = sb.ToString();

<html xmlns="" >
<head runat="server">
    <title>HttpCookieCollection Example</title>
    <form id="form1" runat="server">
      <asp:Label id="Label1" runat="server"></asp:Label>

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0